How to dump/find parity of RAID-5 file?

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Hi.

Came across this thread https://www.mail-archive.com/linux-btrfs@xxxxxxxxxxxxxxx/msg55161.html 
Exploring possibility of adding test-scripts around these area using dump-tree & corrupt-block.But
unable to figure-out how to get parity of file or find its location.  dump-tree output gave,

    item 5 key (FIRST_CHUNK_TREE CHUNK_ITEM 145096704) itemoff 15557 itemsize 144
        length 134217728 owner 2 stripe_len 65536 type DATA|RAID5
        io_align 65536 io_width 65536 sector_size 4096
        num_stripes 3 sub_stripes 0
            stripe 0 devid 3 offset 63111168                 # Is this parity?Seems empty?
            dev_uuid f62df114-186c-4e48-8152-9ed15aa078b4
            stripe 1 devid 2 offset 63111168                 # Contains file data-stripe-1
            dev_uuid c0aeaab0-e57e-4f7a-9356-db1878876d9f
            stripe 2 devid 1 offset 83034112                 # Contains file data-stripe-2
            dev_uuid 637b3666-9d8f-4ec4-9969-53b0b933b9b1
thanks.

Cheers.
Lakshmipathi.G
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