AFAIK the interesting thing about these Illumos Forks is ZFS support together with a kernel based SMB server ability using it as file server.

After enabling a share, connect as root and set NTFS alike ACL via Windows. The SMB server is using Windows SID (not uid/gid) as ACL and Windows-ish SMB groups on Illumos (not Unix groups)

See https://illumos.org/man/8/smbadm