I'm refinishing a nice oak dining table. The open grain ends of the wood
absorbed so much stain that they got too dark and I don't like the look.

I'm not familiar with wood grain filler. Would this fill in those "end"
pores and lessen the stain darkening?
If I use this stuff at all, should I use it on the whole table?
What brands and colors are best? The stain I'm using is red-brown mahogany.
I assume I would rub in the grain filler, then stain - correct?

Thanks