If the sentence is complete in itself, probably the latter. Context will probably make this clear; for example, the former reading would be the one for: "We can only be so close because of all we have been through together.."
In conversation, 'close' would receive more stress in 'very close', 'so' in close to this limited degree'.
Purists would put 'only' before 'so', not before 'be'.
you posted "thank you so much for these information"....As far as I know, "information" is uncountable... so I think that 'these' is incorrect to use with 'information'...the same goes with "they are good to know" you may say 'thank you for the information....