samba - How to let smb share mount via fstab assign full permission to new created file or directory?

How can we fstab mount a samba share that give permission 0777 (to every samba users in the write list) for new created directory or files? E.g. I created a new directory in client PC (Ubuntu 12.10), and want the directory to have permission drwxrwxrwx in the server (Ubuntu 12.04 LTS).

dir_mode=0777,file_mode=0777 already been set in the fstab, still no effect. I can read/write the mounted smb share, but other users in the write list cannot write to the new directory created by me. The permissions in server is always drwxr-xr-x.

Other option that I have tried 'nounix', 'noperm','uid'. But still cannot get it work.

Any idea?