Reason for the btrfs subvolumes is that systemd-nspawn has an -x flag, which allows ephemeral containers to run - good for stateless apps 
The systemd-nspawn adventures are going well - introduces btrfs, now have neat copy-on-write base images of Node & Alpine Linuxpic.twitter.com/sIZj1ptJpb
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If you wanna create your own btrfs (sub)volumes, here's a lil guide how to https://github.com/yoshuawuyts/knowledge/blob/master/computers/unix/btrfs.md …
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