First time hearing about Versity for me too. I thought "S3 Gateways" were an Amazon-only service rather than something mere mortals could set up.

I've been trying to give some containers (LXC/D and OCI) unprivileged access to a network-accessible ZFS filesystem and this might be what I need. Managing UID/GID through bind-mounts from the host to the container (ie NFS on host) has been trickier than I was expecting.