What is the resort of Nibbaana? In Unnabho Brahmano Sutta: The Brahman Unnabha  says  


  "There are, Brahman, these five sense-faculties... which do not share
  in each other's sphere of action. Mind is their resort, and it is mind
  that profits from their combined activity."
  
  "But, good Gotama, what is mind's resort?"
  
  "Mind's resort, Brahman, is mindfulness."[4]
  
  "Then, good Gotama, what is the resort of mindfulness?"[5]
  
  "The resort of mindfulness, Brahman, is liberation."
  
  "Then, good Gotama, what is the resort of liberation?"
  
  "The resort of liberation is Nibbaana."
  
  "Then, good Gotama, what is the resort of Nibbaana?"
  
  "That question goes too far Brahman. No answer can encompass it. The
  aim of the holy life, Brahman, is immersion[6] in Nibbaana, it has
  Nibbaana for its final end, Nibbaana for its conclusion."


Is this suttha says Nibbaana resort on five seance faculties?  or If Not how can it seance?
In my opinion, "resort" is a bad translation for patisaranam (literally, something other things rest on) -- a better option in this particular context would be "apex". Compare with following simile from Milindapanha:


  Like in a building with a pointed roof: whatever rafters they are, they all rest on the apex, lean towards the apex, meet at the apex, and the apex is pointed to as their chief. So is the samadhi in its relation to the other wholesome dharmas.


It does make more sense this way, doesn't it:


  Brahman Unnabha: As the five faculties are of different scope and range, and do not share in each other's sphere of action, what is their apex, and who profits from their combined activity?
  
  Buddha: Mind is their apex, and it is mind that profits from their combined activity.
  
  B.U.: But, good Gotama, what is mind's apex?
  
  B: Mind's apex, Brahman, is mindfulness.
  
  B.U.: Then, good Gotama, what is the apex of mindfulness?
  
  B: The apex of mindfulness, Brahman, is liberation.
  
  B.U.: Then, good Gotama, what is the apex of liberation?
  
  B: The apex of liberation is Nirvana.
  
  B.U.: Then, good Gotama, what is the apex of Nirvana?
  
  B: That question goes too far, Brahman.