[Samba] allow creating files but not deleting

[Toni Casueps]

I need to create a directory where a user can create and work with files but 
not delete them. Other users can do anything in that directory. I have a 
recycle bin set up but I must make it impossible to delete the files.
I have tried setting the sticky bit on the directory, and the "delete 
readonly" option of smb.conf to "no", but the user can always delete the 
files ...