Dear OmarMa,
The solution I found for your issue is not in snap, but gdal has a “Sieve” filter which I find quite effective.
Try running a gdal command with
gdal_sieve -8 your_tif.tif your_sieved_tif.tif
more info:http://www.gdal.org/gdal_sieve.html
You could do the same in qgis: https://docs.qgis.org/2.8/en/docs/user_manual/processing_algs/gdalogr/gdal_analysis/sieve.html
Hope this helps,
Thijs
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