[Samba] du size differences

[webtrekker at cox.net]

We just upgraded several clients and a server to SLES9. The clients mount a SMB volume on the server and when a du command is ran across the network the sizes are vastly different.  Using NFS or looking at the directory via ssh and the sizes match.
Is there a switch I am missing that "fixes" this?  Using an older RH7 client to the SLES9 server did not have this issue.
Thanks for your help,
Patrick