Reported upstream. This is not ubuntu specific problem.
https://bugzilla.gnome.org/show_bug.cgi?id=653727
** Bug watch added: GNOME Bug Tracker #653727
https://bugzilla.gnome.org/show_bug.cgi?id=653727
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Desktop Bugs,
I also want to note this is a serius bug for timestamp related file
synchronisation. (Multi node home directory synchronisation over secure
SFTP)
Reproduce:
SFTP already mounted in nautilus (automatic by gigolo)
cd ~;touch -d '1 May 2012 10:22' test.txt
stat test.txt
cp test.txt .gvfs/SFTP on