[Samba] User/groups between samba and active directory

[Justin B. Kay]

I have an active directory server which I can authenticate to in order to 
access shares on the samba server (3.0.0).  When I create a file on the samba 
server from a windows client the user name is DOMAIN+username and the group 
is DOMAIN+Domain Users.  My question is how to set permissions on folders in 
linux to allow DOMAIN+Domain Users/username to create files without setting 
the permissions to world write access.  Any good online reading about this 
anywhere?

Justin