Adding FreeNas groups using windows permissions

[Keresian]

I know that I can manually use a post init script and add groups manually using the following "script"

#!/bin/bash
/usr/local/bin/net groupmap add ntgroup="ShareUsers" unixgroup=shareusers type=d rid=512

but is there any other way to make it so I can locate freenas 'groups' using client system without the manual addition of them to the script?