Why do bind mounts prevent snapshots?

Hello,

I'm new to proxmox. Today I tried to take my first snapshot of an unprivileged container. Instead I found the button disabled and the message "The current guest configuration does not support taking new snapshots". After reading up in these forums, I saw references to this storage documentation indicating it was due mounting directories from the host into mount points in my container:

This backend assumes that the underlying directory is POSIX compatible, but nothing else...

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