Права для самбы

man chmod
The  restricted deletion flag or sticky bit is a single bit, whose interpretation depends
       on the file type.  For directories, it  prevents  unprivileged  users  from  removing  or
       renaming  a  file  in  the  directory  unless they own the file or the directory; this is
       called the restricted deletion flag for the directory, and is commonly  found  on  world-
       writable  directories  like /tmp.