[Bug 1432871] Re: `df` shows bind mounts instead of real mounts.

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https://bugs.launchpad.net/bugs/1432871

Title:
  `df` shows bind mounts instead of real mounts.

Status in Ubuntu:
  New

Bug description:
  Depending on mount path length df sometimes prioritizes showing bind
  mounts over real mounts

  for example.
  $ mount
  <snip>
  192.168.1.2:/raid on /raid type nfs (rw,nosuid,nodev,noexec,vers=4,addr=192.168.1.2,clientaddr=192.168.1.3)
  /dev/sdc5 on /data type ext4 (rw)
  <snip>
  /data/a on /a type none (rw,bind)
  /raid/temp on /b type none (rw,bind)

  $df
  Filesystem           1K-blocks       Used  Available Use% Mounted on
  <snip>
  /data/a              449830616  229975284  196982196  54% /a
  /raid/temp          7752072192 5581343744 1780023296  76% /b
  </snip>

  I'd expect to see the real mount prioritized over the bind mount.  Like so.
  $df
  Filesystem           1K-blocks       Used  Available Use% Mounted on
  <snip>
  /dev/sdc5            449830616  229975284  196982196  54% /data
  192.168.1.2:/raid   7752072192 5581438976 1779929088  76% /raid
  <snip>

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