Hello, Jake. It seems that while the long-awaited network APIs are in 8.0.2, the CIFS share ACL APIs are not. They do appear to be in 8.1 (7-mode).
In the meantime, you should be able to accomplish what you need using Invoke-NaSsh:
PS C:\> 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