Setting User Permission to hide products of other user
This sounds like a feature request really.  And/or possible a use case for Craft 3s forthcoming multi-site features.  Although C3 + Commerce for it is a ways off yet (6 to 9 months apparently)

You could perhaps use something like a custom field for the 'owner' of each product, and Zenbu to set up filtered views for each of the editors (just guessing, I've not used Zenbu personally)

https://zenbustudio.com/software/zenbu-craftcms