FileNameDrop

FileNameDrop["name", n] drops the first n path elements.

FileNameDrop["name", -n] drops the last n path elements.

FileNameDrop["name"] drops the last path element (filename).

Examples

Drop last element:

FileNameDrop["/path/to/file.txt"]
(* "/path/to" *)

Drop first two elements:

FileNameDrop["/path/to/file.txt", 2]
(* "to/file.txt" *)

Please visit the official Wolfram Language Reference for more details.