Hey Ham,
Solaris 11 includes SMB server and client services to share files. I'm not familiar with Samba's force user feature. I believe that when you map a share to a Window system, it is for a specific user. When that user creates files, they will be owned by that user.
Here's the SMB doc:
http://docs.oracle.com/cd/E36784_01/html/E36832/index.html
Is there a reason why files in your S10 Samba environment are not owned by a specific user when they are created?
Thanks, Cindy