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

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?