How to find block size of filesystem

How do I find block size of an partition on Linux?

 # tune2fs -l /dev/sda1 | grep -i 'block size'
   Block size:               1024

How do I find block size of a filesystem on Linux?

 # tune2fs -l /dev/mapper/filesystem | grep -i 'block size'
   Block size:               1024

 # dumpe2fs -h /dev/dm15

 # dumpe2fs | grep -i 'Block'

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