# Functions
Filter keeps the msg fields that are listed in the paths and clears all the rest.
NestedMaskFromPaths creates an instance of NestedMask for the given paths.
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Overwrite overwrites all the fields listed in paths in the dest msg using values from src msg.
Prune clears all the fields listed in paths from the given msg.
# Type aliases
NestedMask represents a field mask as a recursive map.