None may be construed as either singular or plural, according to the thought to be conveyed: “no amount” (when the following noun is singular) or “no individuals” (when the following noun is plural).

Right: None of the fruit was eaten.
Right: Not one of the volcanoes in Chile is active.

When the meaning is “not one,” it is better to use not one than none with a singular verb.

Right: Not one of the guests has arrived.
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