boundos:insideBaseDirEval: return true if baseDir is "/" #48
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insideBaseDirEval would fail if baseDir was "/".
Since "/" contains anything, and can never be a symlink, just return true, nil if baseDir is "/".
Add a simple test for this case.
Also, while we are at it, have the returned error be a lot more informative: show the name and the base diectory; further, have it wrap os.ErrNotExist should anyone wish to use errors.Is at some point.