Improvements for readdir

[rohanpm]

It is currently possible for a file to be considered uncovered when the file is never accessed, yet it is possible that a directory listing has been performed on the file's parent directory and the file's basic metadata has been used in that way.

Can anything be done to improve this?

At minimum, it would probably be possible to mark files as either 'not accessed', 'accessed' or 'directory accessed'. The latter case would be an indicator that the file's containing directory has been read and therefore the presence of this file might have influenced some code.