This is an intriguing evolution of the transmogrification idea, 
…
If there is a volume, then all containers do see it simultaneously right? (Just as bind-mounts?)
Relatedly, it would be handy if FUSE mounts and similar could selectively be made visible to other containers…
(@rubys mentioned that this containers feature might eventually allow for more composable and modular LiteFS—as opposed to asking people to expertly hand-craft a litefs.yml and (pretty intrusively) reshape their usual entrypoint into a subprocess (of litefs)…)
[Things like background rsync replication, Tarsnap, and fly-atc might also be snap-in options someday.]