Does Naruto and everyone else know the truth about Itachi?
As previously posted Naruto, Kakashi and Yamato were told all at the same time by Tobi before the 5 kage summit. 

Furthermore, Naruto had a very strong inference to go on when he fought the zombie-like Itachi and Pain in the 4th great shinobi war. 

But the only person who knows of every single full detail is Sasuke as Itachi shared everything with Sasuke when they defeated Kabuto in the 4th great shinobi war arc.