Does sankhara disappear in Samantha meditation or insight meditation? If the doer disappears, all the  external objects disappear, what remains is the knower. Knower is known and knows.  Knower is consciousness,inner aspect.

Knower,outer aspect,objects. 

Sankhara appears for Knower 

If sankhara disappears pure consciousness will arise.

Which kind of a meditation  sankhara disappears?
One moment Shankaras are noticed is during vipassana meditation through a detailed body-observation as you go across the areas where feelings are more rude or notorious.

In order to make disappear the shankara, the acceptance of the feelings which arise during a concrete body area observation is needed. Understand the feelings, then accept them.

This acceptance, releases  the shankara from the whole metaphysic body of the meditator, not just the physical one, releasing the emotional concept underlaying the apparition of the shankara. 

Technically upon shankara dissapears, there will not be possible that the same concept generates a new shankara as it is learnt as inner experience. This allows the character to completely release misery and thus obtain a true paññā in the path of illumination.