ok fatto.
serve importare os e usare i suoi attributi filename, st_mtime, ecc....
codice:
import paramiko
import traceback
import sys
import os
import time

try:
    t = paramiko.Transport((........))
    t.connect(........)
    sftp = paramiko.SFTPClient.from_transport(t)
    attr = sftp.listdir_attr('public_html/TXT_CRONOS/log')
    print "NOME  " + "DATA   " + "DIMENSIONE"
    for i in  attr:
        print i.filename + " - " + time.ctime(i.st_mtime)
    sftp.close()
    t.close()

except Exception, e:
    print '*** Caught exception: %s: %s' % (e.__class__, e)
    traceback.print_exc()
    try:
        t.close()
    except:
        pass
    sys.exit(1)