Checks if a directory is within its parent
https://stackoverflow.com/questions/37521893/determine-if-a-path-is-subdirectory-of-another-in-node-js
True if dir is within its parent.
Parent path name
Child path name
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Checks if a directory is within its parent
Remarks
https://stackoverflow.com/questions/37521893/determine-if-a-path-is-subdirectory-of-another-in-node-js
Returns
True if dir is within its parent.