Hi Steven,
I’m not sure how well or completely Rockstor has handled this, I don’t believe that it auto-creates per-user shares.
This would require ‘Active Directory’ integration, in order to get the user list from Windows, so you should probably start here:
https://forum.rockstor.com/t/rockstor-active-directory-ad-integration-implementation/561
From there, you’re probably in the realm of custom scripts to define shares in pools and setup Samba on them.