Facebook is planning to drop support for FQL after V2.0 https://developers.facebook.com/docs/apps/changelog/#v2_0_fql
The below task could be done easily with FQL
The field shares does not need the .summary(true) at the end. It will bring always the total. But the likes and comments does need .summary(true)
Example:
[POST_ID]?fields=shares,likes.summary(true),comments.summary(true)
Improved version works with Graph Api v2.11 (add limit(0) to removes lists of likes and comments and get only summary data):
[POST_ID]?fields=shares,likes.summary(true).limit(0),comments.summary(true).limit(0)
This will bring the total count of shares, comments and likes.
You may have a access_token with an read_stream permission to get the shares count.