Hi, all:        I am reading the implementation of shared-subtree in linux 
kernel. There are two limits about move operation confused me badly, I have 
read the design document -- Shared-Subtree Concept, Implementation, 
andApplications in Linux ,but still puzzled.
1.Why can't move a mount residing in a shared mounts?2.Why can't move a mount 
tree containing an unbindable mount to a shared mount?Is it not a good way to 
prune out unbindable mounts just like rbind semantics do?   Thanks in 
advanceRock Lee--------------------------------

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