How about this:
Get-NaNfsExport | select pathname,@{n="RO";e={$_.SecurityRules.ReadOnly -join ','}},@{n="RW";e={$_.SecurityRules.ReadWrite -join ','}},@{n="Root";e={$_.SecurityRules.root -join ','}} | Format-list
I did Format-List for this example but you could Format-Table or export to CSV. Format-List seems to be a cleaner output than F-T with a long list of IPs but that's probably because I don't know how to expand columns.
OUTPUT:
Pathname : /vol/datastore01
RO :
RW : 192.168.102.103,192.168.120.15,192.168.102.105,192.168.120.16,192.168.102.109,192.168.120.18,192.168.102.107,192.168.120.17,192.168.102.7,192.168.99.41,192.168.102.9,192.168.99
.42,192.168.102.11,192.168.99.43,192.168.102.23,192.168.99.49,192.168.102.25,192.168.99.50,192.168.102.27,192.168.99.51,192.168.102.29,192.168.99.52,192.168.102.13,192.168.99.4
4,192.168.102.71,192.168.99.77,192.168.102.73,192.168.99.78,192.168.102.75,192.168.99.79,192.168.102.77,192.168.99.80,192.168.102.37,192.168.99.56,192.168.102.15,192.168.99.45,
192.168.102.17,192.168.99.46,192.168.102.19,192.168.99.47,192.168.102.21,192.168.99.48,192.168.102.31,192.168.99.53,192.168.102.33,192.168.99.54,192.168.102.35,192.168.99.55,17
2.25.102.79,192.168.99.81,192.168.102.81,192.168.99.82,192.168.102.83,192.168.99.83,192.168.102.85,192.168.99.84,192.168.102.87,192.168.99.85,192.168.102.89,192.168.99.86,172.
25.102.91,192.168.99.87,192.168.102.93,192.168.99.88,192.168.102.67,192.168.99.73,192.168.102.69,192.168.99.74,192.168.102.95,192.168.99.89,192.168.102.97,192.168.99.90,192.168
.102.99,192.168.99.91,192.168.102.101,192.168.99.92,192.168.102.39,192.168.99.59,192.168.102.43,192.168.99.61,192.168.102.41,192.168.99.60,192.168.102.47,192.168.99.63,192.168.
102.49,192.168.99.64,192.168.102.51,192.168.99.65,192.168.102.53,192.168.99.66,192.168.102.45,192.168.99.62,192.168.102.55,192.168.99.67,192.168.102.57,192.168.99.68,192.168.10
2.59,192.168.99.69,192.168.102.61,192.168.99.70,192.168.102.63,192.168.99.71,192.168.102.65,192.168.99.72
Root : 192.168.102.103,192.168.120.15,192.168.102.105,192.168.120.16,192.168.102.109,192.168.120.18,192.168.102.107,192.168.120.17,192.168.102.7,192.168.99.41,192.168.102.9,192.168.99
.42,192.168.102.11,192.168.99.43,192.168.102.23,192.168.99.49,192.168.102.25,192.168.99.50,192.168.102.27,192.168.99.51,192.168.102.29,192.168.99.52,192.168.102.13,192.168.99.4
4,192.168.102.71,192.168.99.77,192.168.102.73,192.168.99.78,192.168.102.75,192.168.99.79,192.168.102.77,192.168.99.80,192.168.102.37,192.168.99.56,192.168.102.15,192.168.99.45,
192.168.102.17,192.168.99.46,192.168.102.19,192.168.99.47,192.168.102.21,192.168.99.48,192.168.102.31,192.168.99.53,192.168.102.33,192.168.99.54,192.168.102.35,192.168.99.55,17
2.25.102.79,192.168.99.81,192.168.102.81,192.168.99.82,192.168.102.83,192.168.99.83,192.168.102.85,192.168.99.84,192.168.102.87,192.168.99.85,192.168.102.89,192.168.99.86,172.
25.102.91,192.168.99.87,192.168.102.93,192.168.99.88,192.168.102.67,192.168.99.73,192.168.102.69,192.168.99.74,192.168.102.95,192.168.99.89,192.168.102.97,192.168.99.90,192.168
.102.99,192.168.99.91,192.168.102.101,192.168.99.92,192.168.102.39,192.168.99.59,192.168.102.43,192.168.99.61,192.168.102.41,192.168.99.60,192.168.102.47,192.168.99.63,192.168.
102.49,192.168.99.64,192.168.102.51,192.168.99.65,192.168.102.53,192.168.99.66,192.168.102.45,192.168.99.62,192.168.102.55,192.168.99.67,192.168.102.57,192.168.99.68,192.168.10
2.59,192.168.99.69,192.168.102.61,192.168.99.70,192.168.102.63,192.168.99.71,192.168.102.65,192.168.99.72