The error is caused by OS X trying to save metadata for copied files in resource forks (NT terminology) / named streams (Mac terminology). If the server (usually Samba) doesn’t support this it can be disabled
- For a Mac user, when connecting to any SMB server, write
[default] streams=no in ~/Library/Preferences/nsmb.conf
- For all Mac users, when connecting to a specific share
touch "/shared dir/.com.apple.smb.streams.off"
while there, you should also do a
touch "/shared dir/.metadata_never_index"
- Samba can also disable the forks and extended attributes for all clients, use
[global] ea support = no unix extensions = noin /etc/smb.conf