Hi,

Can anyone tell me the approximate value of parasitic capacitance between a component and the pcb or component and its ground plane on the pcb

 

Definitely less than 100pF, probably less than 10pF and maybe less than 1pF.
It all depends on the areas involved and the distance between them.
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/pplate.html