This is a topic near to my heart. As someone with Type 1 diabetes, and someone that loves fruit, I'm very good at tracking carbs and sugar in various fruits.

If you stick to fresh fruits, you're probably fine. The real concern comes when people mistake things like fruit juice or fruit that's been packaged in a can and soaking in high-fructose corn syrup for god knows how long and calling it "fruit". On things like that, hitting that daily 300g of carbs is surprisingly easy.