In what way do postmodern writers often blur fiction and non fiction

Postmodern writers often write about a true event, and then include details that might not have happened, or change parts of the story to fit with their personal view, making the story based on a true story, but not completely true.

one thousand and one nights, also known as arabian nights is a collection of stories whose basic structure is that of embedded narrative. this technique refers to a main story which works as the common frame - or framing narrative - for the other stories, and then this series of stories which are connected to the main one. this technique can also be referred to as a story within a story. the stories stem from the original tale, some begin and end on their own, some are connected to the previous or following one, by means of questions that are answered in the subsequent tale, or characters which reappear.

sorry but can you explain the question because i didn’t understand it