Nice, you reminded me of my own incomplete Rust rewrite of the Ruby ZFS snapshot script I wrote about a decade ago, and this bit of yak shaving that ended up derailing me: https://github.com/Freaky/command-limits

I ended up finishing neither, and should pick them back up!

(I snapshot in big chunks with xargs to try to minimise temporal smear - snapshots created in the same `zfs snapshot` command are atomic)