[Samba] linux-to-linux share config

[gobo]

my apologies if this is a duplicate, i never saw it come across.  i'm
really stuck.

trying to set up a server with linux-linux and linux-windows shares.
i can't seem to get a linux share built where cp -p won't issue the
"preserving permissions for ... denied" message.  the clients will
have the share mounted system wide (script in rc.d) and all users
to have r/w on the share. got rid of masks, removed the win shares
and went back to simple.

[nas3]
security = user  (this is actually in global)
path = /storage
valid users = nas3 lab
force user = engr
force group = users
read only = No

the use of masks for a linux share don't seem to be needed, but
i must not be fully understanding something.
any suggestions?

server: v3.5.2-i486 (slackware 13.1)
client: v3.5.4-5.3.1-x86_64 (opensuse 11.3)