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Linux has this built in...

By default, only root can use the last 5% of disk space.

That means you can fire up a root shell and know you have a buffer of free space to resolve the issue.

But now we have Docker, which means all the containerized workflows will run as root....

I suspect you need to be root in the root user namespace... So docker doesn't get this special power...

Docker does not use user namespaces by default (and some features are unavailable when using them).

I believe this is an ext{2,3,4} feature. Unsure if it exists on btrfs, zfs, etc.