If everything's 'folk' then 'folk' means nothing.

You're learning fast, Grasshopper!

Seriously, Pip - all folk is to me is getting pissed in a roaring singaround in a filthy back-room somewhere and communing with something that has undeniable potency. I wouldn't go so far as folk is nothing, but I feel that, like the Tao, its essence is unsayable:

The Tao that can be told is not the eternal Tao.
The name that can be named is not the eternal name.
The nameless is the beginning of heaven and Earth.
The named is the mother of the ten thousand things.
Ever desireless, one can see the mystery.
Ever desiring, one sees the manifestations.
These two spring from the same source but differ in name; this appears as darkness.
Darkness within darkness.
The gate to all mystery.

Lao Tzu (trans. Gia Fu Feng)