Modern df lists the actual fs types for those 'none' devices. E.g.
udev, tmpfs, et al. I'm guessing the reason that '-x none' was not
excluding them in this old df version was because the type wasn't
literally 'none' but perhaps \0 or else was just not being displayed.
In any case, I no longer
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https://bugs.launchpad.net/bugs/843306
Title:
df ignores fs type none in options
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