Measuring Availability Group synchronization lag - Clarifications Can I get some help on below

As I have started and learning about the Measuring of Availability Group synchronization lag between replicas inclusive of BCP , I want to understand and learn that does this query or dashboard show the values including FileStream synchronization lag ? 

My Databases are with FileStream enabled . 
I am using SQL Server 2014 SP2 AOAG.

Please help me understand the above point and kindly advise me with good link or query to measure the Sync lad between replicas.
I learned that the AG Dashboard is made up using the sys.dm_hadr_database_replica_states  results . Thanks for all help.

I got an answer what I am looking for :

filestream_send_rate (bigint ) 

The rate at which the FILESTREAM files are shipped to the secondary replica, in kilobytes (KB)/second.