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Pack canny_tudor -- prolog/canny/files.pl
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 absolute_directory(+Absolute, -Directory) is nondet
Finds the directories of Absolute by walking up the absolute path until it reaches the root. Operates on paths only; it does not check that Absolute actually exists. Absolute can be a directory or file path.

Fails if Absolute is not an absolute file name, according to is_absolute_file_name/2. Works correctly for Unix and Windows paths. However, it finally unifies with the drive letter under Windows, and the root directory (/) on Unix.

Absolute- specifies an absolute path name. On Windows it must typically include a driver letter, else not absolute in the complete sense under Microsoft Windows since its file system supports multiple root directories on different mounted drives.