Multiple SQL Server instances with FileStream enabled
Did found the answer in SQL Server support site.
https://connect.microsoft.com/SQLServer/feedback/details/793017/filestream-problem-when-installing-sql-server-2012-sp1-side-by-side-with-sql-server-2008-r2
It's a bug in SQL Server 2012. Hear is the copy of workaround suggested.

A workaround is to put the FILESTREAM containers of either a SQL Server 2012 instance or a prior version instance in a different volume by relocating or recreating them.
This will make the SQL Server 2012 RsFx driver (RsFx020x) attached to a different volume, so it won't interfere with the requests to the driver of a prior version.
For more info on relocating filestream dirs, please see http://msdn.microsoft.com/en-us/library/ms345483.aspx.
After relocation or recreation (it might need to restart the SQL Server), &quot;fltmc instances&quot; command will indicate if the RsFx drivers are attached to different volumes. For example, the result should look like this (excluding unrelated lines):
Filter                Volume Name                             Altitude        Instance Name
RsFx0201             C:                                     41002.01    RsFx0201 MiniFilter Instance     0
RsFx0105             D:                                     41001.05    RsFx0105 MiniFilter Instance     0