Is mental resilience inherited or acquired through experience?

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We often have heard tales of people succeeding in spite of odds. In every sphere of life, we meet people and some of them have good mental resilience. Their ability to cope with challenges and bounce back from things has always been interesting. I know one individual who experienced hardships early in life. Seems he has developer stronger coping mechanisms and does not much social support. I often have felt he is stone cold when it comes to emotions and has a poker face all the time. I am aware he does mindfulness but not sue how he manages to do things. One of my acquaintances mentioned mental resilience is inherited. Genetics factors can help such as temperament and neurobiology come into picture and can decided how a person react to external pressures. They have better emotional regulation and cognitive reframing. According to him, it is not adversity that creates resilience rather genetics. According to some babies never cry even if they have a bad fall where as others cry heavily. What do you think mental resilience is innate trait or learned ability?