interpersonal issues - Should a postdoc talk about his depression with his mentor?

I am a postdoc in mathematics and I work in the US. Two months ago I was diagnosed with moderate depression. In retrospect, I can say that I must have starting suffering from it last spring, though I was completely unaware of it at the time. I am currently under treatment, and symptoms are getting better. In particular my work rhythm is back to be usual. Anyway, I was told that I should continue the treatment for a few other months for safety.

I was wondering whether I should talk about this to my mentor, coauthors or somebody at the department. On one hand, my concern is that they might have realized my slowing down and thought that I was lazy or that I was not interested in doing research on our projects; on the other hand, I am afraid of being stigmatized in the future as a non-reliable person because I had depression.