How does suspension damping differentiate between high and low speed?

I’m talking internals here, not knobs on the top. Am I right in thinking:-

1) Low speed is usually controlled by (variable sized) hole(s) which always allow some flow. The total area of hole(s) controls the degree of damping and closing all holes produces lock out.

2) High speed is controlled by some sort of shim stack that only opens up once a certain fluid pressure is reached?

Someone please educate me.

In a pike the shim is held down by a spring that compresses as the oil flow quickens if I remember correctly.

A sprung loaded pin in a shaft does the same thing too, as does flex in certain parts, like the way RS lockout blow-off works, or a separate floating but sprung piston on the damper shaft. Depends on the design.

Thanks for the replies so far.

Anyone else know anything technical about suspension?

Loco maybe, or someone else who services suspension for a living?