What jobs are most disproportionately transmitted from parents to kids?

In general, people who have a parent with job X are about twice as likely to have job X as a random member of the population. But programmers are 6x more likely, lawyers are 18x more likely, doctors 25x more likely, dentists 80x more likely, and journalists 94x more likely. But the most transmissible jobs all seem blue-collar, with the overall winner being textile machine operators (415x more likely, if both parent and child are male).

(via Scott Alexander's blog)

I wonder, what the rate for prison guards would be.