The song goes back a long way, however it was not widely known in Nova Scotia before the nineteen thirties. It is unlikely that a random group of people standing at a graveside would have known the song. Like much of the production of shattered City..it was not interested in Historical accuracy at all..it was a soap opera during which a minor explosion happened. CBC ought to bury it's head on this one.
Also; I am curious to know what other songs used the tune to which Farewell to Nova Scotia is sung.