Try to start with something like this (for 7-mode):
Get-NaLun | ? {$_.Mapped -eq $true} | % {Get-NaLunMap -path $_.Path} | ft Path,InitiatorGroupType,ALUA,InitiatorGroupName,LunId
Also have a look at "Get-Member", to see all properties of "NaLunMap" objects:
Get-NaLun | ? {$_.Mapped -eq $true} | % {Get-NaLunMap -path $_.Path} | gm
For C-Mode something like this might be sufficient:
Get-NcLunMap | ft Vserver,Path,InitiatorGroup,LunId