local l="lowerdir=$SCRATCH_MNT/lowerdir:$SCRATCH_MNT/lowerdir1"
local u="upperdir=$SCRATCH_MNT/upperdir$tag"
local w="workdir=$SCRATCH_MNT/workdir$tag"
local l="lowerdir=$SCRATCH_MNT/lowerdir:$SCRATCH_MNT/lowerdir1"
local u="upperdir=$SCRATCH_MNT/upperdir$tag"
local w="workdir=$SCRATCH_MNT/workdir$tag"