Find directory binding from registry. The default implementation tries the whole pathname first, then tries successively smaller parts of the path. For example, a pathname "/usr/people/jeroen": "/usr/people/jeroen" "/people/jeroen" "/jeroen" are tried in succession. If no bindings are found, the key "defaultdirbinding" is tried as a fallback association. A NULL is returned if no association of any kind is found.
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