The 10 V for 10 nsec spec was probably not calculated. The process specification only gives dc voltage rating. that is not practical for dc/dc converter circuits. there will always be some over/undershoot on the rising and falling edges. The spec chosen is somewhat arbitrary and represents what we would consider safe an reasonable based on our engineering evaluation tests. There will always be some application with a little more amplitude or a little longer duration that is probably safe as well. That being said, your waveform seems a little high. I cannot tell much about the time, you should probably look at both the rising and falling edge at 10 nsec / div time scale. if the amplitude does prove too big, you can use an RC snubber to suppress it.
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