Some teachers have been asking about how to decrease the hundreds of emails they get in their Inbox from students when they are sharing documents. If students use direct sharing from Google, meaning they click the blue "Share" button and type your name in, they can choose to unclick the box that says "Notify people via email." The students have to uncheck that box each time they share a document with you.
If, for some reason, you don't trust that your students will always remember to uncheck that box, there is a video below explaining how to create a filter. The video is only 3 minutes long, so it shouldn't take long to do.