The Cula-suññata Sutta - Pali Canon and emptiness

**I've closed the question. No need to answer** It's a sore and sensitive subject, emptiness. The Cula-suññata Sutta: The Lesser Discourse on Emptiness. What else is there in the Pali canon that has a direct mentioning of these types of emptiness? My teacher had mentioned that Mahayana goes into emptiness with quite some depth. (There's something really wrong with that sentence!) Can you provide any Mahayana teachings that can help me unpack the types of emptiness mentioned in the Cula-suññata?