Automatic creation of a catalog in catch all postfix configuration

I'm using Ubuntu 16.04 and postifx.

I would like to create a catch all mechanism but I would like to create a directory for each user when incoming mail is intended for a non-existent user.

For example:
incoming mail for example@mydomain.com

There is no user "example", so I would like to create a directory "example" and put this e-mail.

Could you help me?