propagate the mtime (modification time) through the directory/folder hierarchy
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Author: James Abel
propmtime sets the modification time (mtime) of folders/directories to make finding recently
created or changed files easier.
Most OSs only change the modification time of a folder/directory based on its immediate children. This code analyzes a folder and its children, propagating (changing) the modification times of each folder to be the most recent time of all of its children.
propagate the mtime (modification time) through the directory/folder hierarchy