It may be helpful to recall that a futures contract is not an asset like a stock, but rather is a contingent liability. As such, the margin required to open and hold a futures contract is generally referred to as a "performance bond" as it's intended to secure payment of the cash variation due the counterparty should you suffer an adverse price change.
While brokers are allowed to lend money to a client to finance the purchase of a stock (i.e., the margin requirement), I am aware of no exchange that allows brokers to lend the performance bond required on an exchange listed futures contract, regardless of the client's creditworthiness.
Finally, while a long option having a futures contract as its underlying is an asset (a short option would be another form of contingent liability), exchange rules generally require that option purchases be paid for in full as they are considered wasting assets. Some exchange margin rules, however, do effectively allow the market value of fully paid long options to offset the risk margin requirement associated with other options and futures contracts through the SPAN margin methodology.