How do I get this on my guitar, the sound of the strings?

It's kind of hard to deceifer the string instruments in that song. I'm guessing the really tonal Persian sound your looking for is coming from a mandolin. The guitar part in that song sounds very legato from what I can tell. if you want a very tonal sound like that I'd turn the bridge pickup on and pick about an inch an from the bridge. If youre playing an acoustic and don't have pickups or you still want more of that "stringy" sound I'd try using artificial tortoise shell picks. Hope this helps man, rock on! XD