Hi, Glen. One workaround, albeit an inconvenient one, is to send a CLI command using Invoke-NaSsh. The missing APIs return in Data ONTAP 8.1.
PS> Invoke-NaSsh cifs shares
Name Mount Point Description
---- ----------- -----------
ETC$ /etc Remote Administration
BUILTIN\Administrators / Full Control
HOME /vol/vol0/home Default Share
everyone / Full Control
C$ / Remote Administration
BUILTIN\Administrators / Full Control
backups /vol/cifs/backups
everyone / Full Control
vol1 /vol/vol1
everyone / Full Control
wsfcrre_witness /vol/cifs/wsfcrre_witness
everyone / Full Control
rresql_witness /vol/cifs/WSFCRRE_FILES/rresql_witness
everyone / Full Control
wsfcrre_files /vol/cifs/wsfcrre_files
everyone / Full Control
RTPRRE\timothyn / Full Control