resolve
Given a path like a.b.c.d and a set of paths like {a.b.c, a.f.g, h.j}, this returns the original path split on dots such that the first element is in the set. For the above example it would return the array [a.b.c, d].
Typically, the input path is a package name like a.b, followed by a dot and a sequence of field names. The first field name is an extension field; subsequent field names make a path within that extension.
https://developers.google.com/protocol-buffers/docs/overview?hl=en#packages_and_name_resolution Names can be prefixed with a . when the search should start from the outermost scope.
Note that a single input may yield multiple possible answers, such as when package names and field names collide. This method prefers shorter package names though that is an implementation detail.