tl;dr it doesn't. I'm not sure what they're planning in this capacity (I haven't checked out sprites myself), but I would guess that it's going to be a function

tl;dr it doesn't. I'm not sure what they're planning in this capacity (I haven't checked out sprites myself), but I would guess that it's going to be a function of "snapshots" as a mechanism to give multiple clients ephemeral write access to the same disk.