MySQL Data User Ownership

Which OS User will own MySQL Datafiles?

For example:

If i run the next command:

create database test;

It creates a folder on the datadir. Is there a variable that controls the ownership and permissions of that folder?

I know that you can control the user thar will run mysqld daemon by specifying user=username on my.cnf . The files created by mysqld daemon will be owned by that specified user? Or how it works?

"Also, the default permissions for directories inside the mysql data directory:

755 (rwxr-xr-x) for mysql top data directory 700 (rwx------) for each database directory 660 (rw-rw----) for database files" - http://ift.tt/1B5s5Vk