Microservices is a subtype of Services which itself is a functionally-partitioned system. You cannot apply the packaging option to a 3-tier monolith and call the resulting backend and DB layers microservies, can you?

Thank you for the link. I have already mentioned Nanoservices in one of the articles https://medium.com/itnext/introduction-to-software-architecture-with-actors-part-3-on-simple-systems-ada09e28eebf However, my definition may be wrong as I did not work with them in practice. What you described in your article more resembles actor frameworks, like Erlang/Elixir or Akka.