[Samba] Allow copy and deny delete

[Josué Maldonado]

Hello list,

I need to setup a shared dir that allow users from my LAN to copy files 
to it, but deny them from deleting. I searched if that could be done 
with Unix permissions but so far it seems is not possible, so, is there 
way to setup such share in samba.

Thanks in advance

-- 
Josué Maldonado.