Do not calculate size for local volumes with mount
Do not calculate size for local volumes with mount

Local volumes support mount options which, when in use, can mount
external file systems. We don't really need to enumerate these external
filesystems which may be a very slow process.

Signed-off-by: Brian Goff <dc73d0991b982a8303e713ef531a313af77e242a@gmail.com>

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