I can not find a solution for setting a correct mask for anonymous dropped files on a OS X shared folder. All files are created with -rw------- nobody staff, which does not others to access them.
PS: I have decided against a user authentication access for CIFS because OSX requires to have the password stored in a more insecure way then. So the anonymous access sounds the best for me.
MacBook Pro with Retina display, OS X El Capitan (10.11.4)