joint account form 8938

[casey]

Hi
My dad (Canadian resident of Canada) made me (Canadian resident of USA) joint owner of his deposit account (in Canada) in order to avoid probate in the event of his death. The account is wholly funded by him, so according to the CRA the entirety of the interest is his taxable income, not mine (and he does pay all the tax on it). I understand the IRS defers to local law on income from joint accounts - does this also mean I don't need to declare the account on form 8938 as it doesn't seem like I have an interest according to the definition: "You have an interest in a specified foreign financial asset if any income, gains, losses, deductions, credits, gross proceeds, or distributions from holding or disposing of the asset are or would be required to be reported,included, or otherwise reflected on your income tax return."
I'm hoping this is the case as I have no idea of the max account value; on Fincen114 there is a convenient box to tick if you don't know the max account value, but for this one I'd have to make a very ballpark guess which makes me nervous.
Thanks