Convert type() check to dynamic cast in Mount::*
Convert type() check to dynamic cast in Mount::*

Signed-off-by: Brenden Blanco <8e41c261aa8ddb01230a40c21c26a049c1f6d041@plumgrid.com>

iovisor/bcc-fuse,iovisor/bcc-fuse,iovisor/bcc-fuse,iovisor/bcc-fuse