AFAIK, Sun never pushed their patches to Nautilus upstream, which means TimeSlider is only available in their version of GNOME. There's no other GUI wrapper to ZFS snapshots that I know of.
However, you can kind of fake it by using a separate ZFS filesystem for each user's home directory, and then either setting the snapdir property to visible (so they can see the .zfs/snapshot directory), or creating a symlink in their $HOME that points to .zfs/snapshot.
Either of those will make the snapshot directory visible in their file manager of choice.