Yeah, it's only the entire basic Syntax of the language they copied.
Yes, Swift's semantics are different (since it's essentially a domain-specific language designed to make writing Cocoa apps faster), but syntax-wise a Go programmer feels right at home reading Swift.
If you mean by "entire" the spelling of one keyword and the omitting of parentheses. Everything else seems to be more related to C and various Action/ECMAScript like scripting languages.
Yes, Swift's semantics are different (since it's essentially a domain-specific language designed to make writing Cocoa apps faster), but syntax-wise a Go programmer feels right at home reading Swift.