When was hemp fiber invented?

The words "He He Kun Li" appear in The Book of Songs, indicating that hemp fiber has existed for a long time and may have originated in the Spring and Autumn Period. I think it's a pity that young people haven't seen hemp fiber, at least I feel sorry.

I have read many poems about hemp fiber, and the most impressive one is Jiang Xue written by Liu Zongyuan, a poet in the Tang Dynasty: "There are no birds in a hundred mountains, and there are no footprints in a thousand paths. A boat, a bamboo cloak, an old man fishing in the cold river-snow. " Imagine a lonely boat in the snow. There was a fisherman on the boat, dressed in hemp fiber, fishing alone on the snowy river, which suddenly made people respect.

Although hemp fiber is the most primitive rain-proof tool, it has become a noble symbol in the works of literati in past dynasties, which brings me a lot of feelings.