I've never heard Dylan do this. If it's the same song, I've heard Doc Watson sing it on The Essential Doc Watson. I must admit I never imagined Dylan (or anyone else I listened to) doing these types of traditional songs when I was listening to Blonde on Blonde and the albums of that era. I'm going to see Dylan this Friday in Ottawa. Joni Mitchell is also on the bill. I'll let you know how it goes.
Dave T