samba - Jun 2006 - cifs mount and quotas

I configured a samba 3.0.14a PDC on FreeBSD 6.0-RELEASE
with a [homes] share on which I activated user quotas.

From an Ubuntu 5.10 client with smbmount 3.0.14 when I do
smbmount //carioca/user1 /mnt -o "username=user1"
and copy a large file to /mnt I have a "No space left on device"
error which is what I expect.
But with mount.cifs version 1.6 when I do
mount.cifs //carioca/user1 /mnt -o "username=user1"
and copy the same file there is no message and the
command must be interrupted with Ctrl+C

What are my options?

Regards,
Thierry.