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Directories within smbfs shares, or the entire share, are mounted in
the VM (by seneschal) under the "SMB/<share-id>" directory. This allows
multiple smbfs shares, or multiple directories from a single share, to
be shared into the VM without encountering namespace conflicts.

Test: Share root and/or sub-folder of share into Crostini from Files.app
Bug: 962924
Change-Id: I8d2055603741e0b6197ca0d0543497eeca6776e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434599
Commit-Queue: Josh Simmons <simmonsjosh@google.com>
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816021}