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For example, when launching into an isolated process, we need to drop
all mounts inherited from the root namespace.

avc: denied { unmount } for scontext=u:r:zygote:s0 tcontext=u:object_r:fuse:s0 tclass=filesystem permissive=1

Bug: 22192518
Change-Id: Iafbea2c365c1080bdf20d7fa066c304901e582ba