[[ Bug 14060 ]] Only add an additional '..' entry to 'the folders' on OS X.

Bug originally introduced commit bf79e46bd0e3.
[[ Bug 14060 ]] Add bugfix note.
Merge pull request #1522 from peter-b/bugfix-14060

[[ Bug 14060 ]] Only add an additional '..' entry to 'the folders' on OS...