how to get share count of facebook post using post Id

I tried the following ways to get the share count of post.

1st way:

http://ift.tt/1ey9R7D
SELECT%20like_info.like_count,%20comment_info.comment_count,%20share_count%20
FROM%20stream%20WHERE%20post_id%20=%20%22386050065267_10153256675935268%22
&access_token=YOUR_ACCESS_TOKEN

2ns way:

http://ift.tt/1xQ2IHl{object_id}/sharedposts?access_token=YOUR_ACCESS_TOKEN

The above both ways works for some posts and for some posts they are not.

Can anyone help me out with this ?