[Samba] Samba 3.2.4 and alternate data streams

[François Legal]

Hello, 
I just upgraded to 3.2.4, and today I observed in one of my share
that some of the file where being kind of duplicated with a trailing
":Zone.Identifier:$DATA" at the end of filename. 

I think this has to do with alternate data streams, but the point is
the share runs out of an XFS filesystem which is supposed to support
the xattr. 

Why are these files created, and is there any way to prevent this
creation ? 
Thanks 
François