attachment restrict to a particular user in a table

[jishnu_36]

i have requirement had a field of assigned to in a table the particular user only access the attached files in sys_attachment table can any one help me pls.. thankyou   

[jishnu_36]

hi, tnq for reply but i need to hide this management attachments which was present in Screenshot for all users expect assigned to field was reference to sys_user.

[jishnu_36]

Thanks  for reply back but my actual requirement to hide the manage attachment for all user expect assigned to user.