prow/repoowners/repoowners.go
func (o *RepoOwners) LeafApprovers(path string) sets.String {
	return o.entriesForFile(path, o.approvers, true)
}
func (o *RepoOwners) LeafApprovers(path string) sets.String {
	return o.entriesForFile(path, o.approvers, true)
}
// LeafApprovers returns a set of users who are the closest approvers to the
// requested file. If pkg/OWNERS has user1 and pkg/util/OWNERS has user2 this
// will only return user2 for the path pkg/util/sets/file.go