A folder kept because it was empty, then covered by its disk, was said as unhealthy
leftover entries for ever: its entries sit on a hidden empty folder and grant nothing,
so they are now forgotten, and only entries walked onto data under a warrant are kept
to be taken out. A warrant and a kept folder now name their filesystem by mount point,
source and type, so another pool at the same point is a move; records naming a mount
point are read as its name. A record with no access ids is said under a path-free name.
jschoubben
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