SQL Server RLS vs Oracle FGAC
I don't know Oracle, but these the seems to do different things.

RLS is row-level security. I.e., you see this row, but not that row. 

FGAC (fine-grained access control) seems to be about auditing, i.e., "I can see that you did this modification yesterday". That would be more comparable to the Server Audit feature in SQL Server. (Please correct me if I'm wrong, those who know about FGAC.)