Both nature and nurture shape who are. However, nature is no more important than nurture. We have experiences from the time we have genes. They’re equally important, inextricably linked parts of what makes us who we are.
Epigenetics is not the only determiner of who we are. Although our environment plays a role in our environment, our genes are often our real destiny. No amount of environmental perfection will prevent someone with a genetic mutation from developing the subsequent illness. Furthermore, we have some experiences that shape us that are completely separate from our genes – like which school we go to. Despite being linked, nature and nurture are distinct.
Larmarck challenged Darwin in stating that we can pass on our epigenome – which is our environmentally-altered genome. Scientists currently debate this but lean towards agreeing it’s true. 
However, this does not support the nature via nurture argument because once an epigenome is passed on to a child, it’s just their genome. It’s not determined by their environment like it was for their parents.