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Introduce filesystem.ErrEncryptionNotEnabled and
filesystem.ErrEncryptionNotSupported which include the Mount as context,
and translate the corresponding metadata/ errors into them. Then make
these errors show much better suggestions.
Also replace lots of other filesystem/ errors with either custom types
or with unnamed one-off errors that include more context. Fix backwards
wrapping in lots of cases.
Finally, don't include the mountpoint in places where it's not useful,
like OS-level errors that already include the path.
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