While that works for

/foo/../bar          -> /bar
foo/../bar           -> bar
/foo/bar/../../moo   -> /moo
/var/log/../../home/poletti/../../etc/passwd -> /etc/passwd
[download]

it doesn't work for

/foo/..              ->           <- Should be /
foo/..               ->           <- Should be . (?)
..                   ->           <- Should be ..
../foo               -> foo       <- Should be ../foo
../foo/bar           -> foo/bar   <- Should be ../foo/bar
foo/bar/../..        ->           <- Should be . (?)
/foo/bar/../..       ->           <- Should be /
[download]