Problem description

I have a decent idea of how streaming replication in postgres works, by tailing the WALs for new writes that come in. What I am having trouble understanding is which phase of a postgres write does pg_pathman come into picture i.e. before or after write to the WAL.

The high level question that I am trying to answer is that, if I partition tableA on master, can the slave still accept replication stream for tableA which does not have the partitions yet?

Also, what is the recommended way to partition with pg_pathman in a master-slave configuration?

Environment

Postgres version: 9.5
pg_pathman version: 1.4