A Trivial Amount of Fat

I was getting ready to make some refried beans dip with my vegetarian Rosarita when I noticed the small print:  "A trivial amount of fat."

What's trivial?  What's the source of fat?

I looked it up:

http://www.livestrong.com/article/478498-ingredients-in-rosarita-refried-beans/

This is directly from there:

Rosarita Refried Beans comes in several varieties, some of which contain no fat because they do not incorporate lard. For example, the Vegetarian Refried Beans contain canola oil rather than lard. The double asterisk indicates it adds a “trivial amount of fat” rather than trans fat. However the No-Fat Traditional Refried Beans contain partially hydrogenated soybean oil, which adds a “trivial amount of cholesterol.” The words “partially hydrogenated” are a clue that the oil, processed from liquid to semi-solid, contains trans fat. Because the amount is less than 0.5 g, the trans fat value is zero. Other varieties of Rosarita Refried Beans are No Fat Refried Beans With Green Chiles, No Fat Refried Beans With Salsa and No Fat Refried Black Beans.