It seems I trust the web pages too much - in http://zfsonlinux.org/ is
written that it does not ;O)) otherwise I would be using it already.

From the website:

Please keep in mind the current 0.5.2 stable release does not yet support
a mountable filesystem. This functionality is currently available only in
the 0.6.0-rc6 release candidate.

Seems clear to me :)

Niels